18745619 has 2 divisors, whose sum is σ = 18745620. Its totient is φ = 18745618.

The previous prime is 18745589. The next prime is 18745631. The reversal of 18745619 is 91654781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18745619 - 2¹² = 18741523 is a prime.

It is a super-2 number, since 2×18745619² = 702796463386322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18745319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372809 + 9372810.

It is an arithmetic number, because the mean of its divisors is an integer number (9372810).

Almost surely, 2^18745619 is an apocalyptic number.

18745619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18745619 is an equidigital number, since it uses as much as digits as its factorization.

18745619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 18745619 is about 4329.6211150631. The cubic root of 18745619 is about 265.6439495409.

The spelling of 18745619 in words is "eighteen million, seven hundred forty-five thousand, six hundred nineteen".